If you do a Google (Altavista, Lycos, etc) search for "fáth mo bhuartha", you will find many listings. It's often played as an instrumental slow air.

Brian supplied a translation of the last line and now he's promised more. In the meantime, the beginning means roughly -   
It is the cause of my sorrow that I can't visit the lonely glen where my love dwells. There is butter and honey there and the flowers bloom at the beginning of autum. There is no north wind, no enduring snow. There is a harbour for ships and boats there. ...
...

Sharon, you probably can put in accent marks. There are various ways to form them on different computers. On the computers I use, I can either press ctrl and alt keys along with the vowel I wish to accent, or I can press alt plus these numbers: +160 for á, +130 =é, +161=í, +162=ó, + 163 ú . Try those out, but your system may use different codes.

A further complication is that the webpage on which you are posting may display the characters differently to how you saw them when you wrote the message. This has happened on Mudcat at times with the various technical changes. To avoid this it is a good idea, although time-consuming, to use the ASCII Symbols For this you have to type &# (ampersand and hatchmark, & followed by #) followed by the appropriate numbers
Ú 218
Ó 211
Í 205
É 201
Á 193
á 225
é 233
í 237
ó 243
ú 250

Using this method, you will still see the number codes on your screen when you post the message, but they subsequently will appear as accented letters in the message on the thread.

We have been asked not to use "diacritcal marks" in thread headings, but they should be used in postings of lyrics.
See the fada in Irish vowels (thread)